Sorry, I missed the fact that the income is from an inherited IRA. That is not Ohio source income. You should not need to file an OH non resident return.
It was a mistake for the executor to issue you an OH K-1. It was an even bigger mistake if they withheld OH state tax. You'll have to file for a refund.
I further assume you were working on the OH return. Are you working on the IN return, When you say "I am still struggling to properly process the K-1 within TurboTax to effectively allocate the income from the inherited IRA from Indiana to Ohio"? I'm not specifically familiar with IN forms/TT software, but hat's not how it usually works. You don't allocate income on your resident state (IN) return. You pay IN tax on all your income, regardless of the source. Then, your home state gives you a credit for any tax paid to another state.
